Kazuya ends up with Chizuru in the story "Rent-A-Girlfriend." Throughout the series, it is clear that Kazuya and Chizuru develop deep feelings for each other, and by the end of Season 3, they basically become a couple even though they have yet to officially make the relationship public. Despite some setbacks and complications, the story strongly hints that they are meant to be together, and fans generally expect them to end up as a couple. In the manga, it is shown that both Kazuya and Chizuru are in love with each other, even if they struggle to openly express it. Some recent chapters have introduced challenges in their relationship, but the attraction and bond between them remain strong, making it very likely they will end up together at the conclusion of the story.

For clarity:

• Kazuya and Chizuru have a complicated but close relationship.
• They become effectively a couple by Season 3 of the anime.
• The manga hints strongly that they will officially be together.
• There are some plot hurdles and moments of doubt, but overall they are the main romantic pairing.

If the question relates to the Tekken character Kazuya Mishima, he is romantically linked with Jun Kazama in the Tekken storyline, though this is a separate franchise from Rent-A-Girlfriend.

Please specify if the question is about Kazuya from Rent-A-Girlfriend or Kazuya Mishima from Tekken for a more focused answer.